All ages approximate:
Kirk - 32-36 (TOS); 40 (TMP); 52-60 (TWK-Generations); 0-25 (ST11)
Picard - 59-65 (TNG); 66-74 (TNG movies)
Sisko - 37-43 (DS9)
Janeway - (assuming the non-canon 2335 date) 36-43 (VOY); 44 (NEM)
Archer - 39-43 (ENT); 49 (TATV); 145 (ST11)
Spock - 22 (Cage); 33-37 (TOS); 41 (TMP); 53-61 (TWK-TUC); 136 (Unification); 155 (ST11, Prime); 20ish-26 (ST11, alternate)
Scott - 43-47 (TOS); 51 (TMP); 63-71 (TWK-Generations); 72 (Relics); 36 (ST11)
Sulu - 28-32 (TOS); 36 (TMP); 48-56 (TWK-Flashback); 21 (ST11; note: Birtyear might've changed)
Chekov - 22-24 (TOS); 28 (TMP); 40-48 (TWK-Generations); 17 (ST11; note: birtyear HAS changed; should've been 13)
Uhura - (using non-canon 2239 date) 27-30 (TOS); 34 (TMP); 46-54 (TWK-TUC); 16-19 (ST11; note: birthyear has likely changed)
McCoy - 39-42 (TOS); 46 (TMP); 58-66 (TWK-TUC); 137 (Farpoint); 28-31 (ST11)
Pike - (assuming the non-canon 2219 date) 35 (Cage); 48 (Menagerie); 36-39 (ST11; Greenwood is in his early fifties)
Kirk - 32-36 (TOS); 40 (TMP); 52-60 (TWK-Generations); 0-25 (ST11)
Picard - 59-65 (TNG); 66-74 (TNG movies)
Sisko - 37-43 (DS9)
Janeway - (assuming the non-canon 2335 date) 36-43 (VOY); 44 (NEM)
Archer - 39-43 (ENT); 49 (TATV); 145 (ST11)
Spock - 22 (Cage); 33-37 (TOS); 41 (TMP); 53-61 (TWK-TUC); 136 (Unification); 155 (ST11, Prime); 20ish-26 (ST11, alternate)
Scott - 43-47 (TOS); 51 (TMP); 63-71 (TWK-Generations); 72 (Relics); 36 (ST11)
Sulu - 28-32 (TOS); 36 (TMP); 48-56 (TWK-Flashback); 21 (ST11; note: Birtyear might've changed)
Chekov - 22-24 (TOS); 28 (TMP); 40-48 (TWK-Generations); 17 (ST11; note: birtyear HAS changed; should've been 13)
Uhura - (using non-canon 2239 date) 27-30 (TOS); 34 (TMP); 46-54 (TWK-TUC); 16-19 (ST11; note: birthyear has likely changed)
McCoy - 39-42 (TOS); 46 (TMP); 58-66 (TWK-TUC); 137 (Farpoint); 28-31 (ST11)
Pike - (assuming the non-canon 2219 date) 35 (Cage); 48 (Menagerie); 36-39 (ST11; Greenwood is in his early fifties)