John Tonelli
L · Born March 23, 1957
Age in each postseason series
- 1979 Quarterfinals (April 16, 1979), Islanders vs Blackhawks 4–0: 22 years, 24 days
- 1979 Semifinals (April 26, 1979), Islanders vs Rangers 2–4: 22 years, 34 days
- 1980 Preliminary round (April 8, 1980), Islanders vs Kings 3–1: 23 years, 16 days
- 1980 Quarterfinals (April 16, 1980), Islanders vs Bruins 4–1: 23 years, 24 days
- 1980 Semifinals (April 29, 1980), Islanders vs Sabres 4–2: 23 years, 37 days
- 1980 Stanley Cup Final (May 13, 1980), Islanders vs Flyers 4–2: 23 years, 51 days
- 1981 Preliminary round (April 8, 1981), Islanders vs Maple Leafs 3–0: 24 years, 16 days
- 1981 Quarterfinals (April 16, 1981), Islanders vs Oilers 4–2: 24 years, 24 days
- 1981 Semifinals (April 28, 1981), Islanders vs Rangers 4–0: 24 years, 36 days
- 1981 Stanley Cup Final (May 12, 1981), Islanders vs North Stars 4–1: 24 years, 50 days
- 1982 Division semifinals (April 7, 1982), Islanders vs Penguins 3–2: 25 years, 15 days
- 1982 Division finals (April 15, 1982), Islanders vs Rangers 4–2: 25 years, 23 days
- 1982 Conference finals (April 27, 1982), Islanders vs Nordiques 4–0: 25 years, 35 days
- 1982 Stanley Cup Final (May 8, 1982), Islanders vs Canucks 4–0: 25 years, 46 days
- 1983 Division semifinals (April 6, 1983), Islanders vs Capitals 3–1: 26 years, 14 days
- 1983 Division finals (April 14, 1983), Islanders vs Rangers 4–2: 26 years, 22 days
- 1983 Conference finals (April 26, 1983), Islanders vs Bruins 4–2: 26 years, 34 days
- 1983 Stanley Cup Final (May 10, 1983), Islanders vs Oilers 4–0: 26 years, 48 days
- 1984 Division semifinals (April 4, 1984), Islanders vs Rangers 3–2: 27 years, 12 days
- 1984 Division finals (April 12, 1984), Islanders vs Capitals 4–1: 27 years, 20 days
- 1984 Conference finals (April 24, 1984), Islanders vs Canadiens 4–2: 27 years, 32 days
- 1984 Stanley Cup Final (May 10, 1984), Islanders vs Oilers 1–4: 27 years, 48 days
- 1985 Division semifinals (April 10, 1985), Islanders vs Capitals 3–2: 28 years, 18 days
- 1985 Division finals (April 18, 1985), Islanders vs Flyers 1–4: 28 years, 26 days
- 1986 Division semifinals (April 9, 1986), Flames vs Jets 3–0: 29 years, 17 days
- 1986 Division finals (April 18, 1986), Flames vs Oilers 4–3: 29 years, 26 days
- 1986 Conference finals (May 2, 1986), Flames vs Blues 4–3: 29 years, 40 days
- 1986 Stanley Cup Final (May 16, 1986), Flames vs Canadiens 1–4: 29 years, 54 days
- 1987 Division semifinals (April 8, 1987), Flames vs Jets 2–4: 30 years, 16 days
- 1988 Division semifinals (April 6, 1988), Flames vs Kings 4–1: 31 years, 14 days
- 1988 Division finals (April 19, 1988), Flames vs Oilers 0–4: 31 years, 27 days
- 1989 Division semifinals (April 5, 1989), Kings vs Oilers 4–3: 32 years, 13 days
- 1989 Division finals (April 18, 1989), Kings vs Flames 0–4: 32 years, 26 days
- 1990 Division semifinals (April 4, 1990), Kings vs Flames 4–2: 33 years, 12 days
- 1990 Division finals (April 18, 1990), Kings vs Oilers 0–4: 33 years, 26 days
- 1991 Division semifinals (April 4, 1991), Kings vs Canucks 4–2: 34 years, 12 days
- 1991 Division finals (April 18, 1991), Kings vs Oilers 2–4: 34 years, 26 days
Age in each season
- 1978-79 (Islanders): 21 years, 192 days to 22 years, 38 days
- 1979-80 (Islanders): 22 years, 192 days to 23 years, 38 days
- 1980-81 (Islanders): 23 years, 192 days to 24 years, 38 days
- 1981-82 (Islanders): 24 years, 192 days to 25 years, 38 days
- 1982-83 (Islanders): 25 years, 192 days to 26 years, 38 days
- 1983-84 (Islanders): 26 years, 192 days to 27 years, 38 days
- 1984-85 (Islanders): 27 years, 192 days to 28 years, 38 days
- 1985-86 (Flames, Islanders): 28 years, 192 days to 29 years, 38 days
- 1986-87 (Flames): 29 years, 192 days to 30 years, 38 days
- 1987-88 (Flames): 30 years, 192 days to 31 years, 38 days
- 1988-89 (Kings): 31 years, 192 days to 32 years, 38 days
- 1989-90 (Kings): 32 years, 192 days to 33 years, 38 days
- 1990-91 (Kings): 33 years, 192 days to 34 years, 38 days
- 1991-92 (Blackhawks, Nordiques): 34 years, 192 days to 35 years, 38 days