If you wanted a more seasoned veteran, they're likely going to be older.
Since MechWarrior / AToW is not like D&D (and others) where stats define the character, aging a character isn't really relevant; Use of the points-only system allows for a player to choose virtually ANY type of character they would want (assuming it would fit in the role & setting), as it should be.
Want an elite-anything? 4300 attributes, 500 in traits (including -500 or so from Enemy, Compulsions, etc), and 1500 in skills = age 29 (5000 @ 21 + 800 through age + 300 from maturation at age 25 = 6300XP).
Attributes: 7, 7, 6, 5, 5, 5, 4, 4
Traits: +5, +3, +2, -2, -2, -1
Skills: 1x 6+, 2x 5+, 3x 4+, 3x 3+, 5x 2+, 2x 1+, 1x 0+
Characters like this would take 2-3 minutes to whip out. Just decide on a hook, and prioritize stats accordingly.
Or, just take the Character Template, and modify it...
Want anything higher? Add a bit more age, or take a chance at the Random Life Event roll.
MechWarrior:
Strength: 5
Body: 6
Dexterity: 7 (or 5)
Reflexes: 5 (or 7)
Intelligence: 5
Willpower: 7
Charisma: 4
Edge: 4
Traits:
Compulsion/Favorite Enemy, CC (-1TP)
Connections (2TP)
Dark Secret (-2TP)
Enemy/CC (-2TP)
Rank (+5TP)
Vehicle (+3TP)
Skills:
Gunnery/'Mech: +6 (Table-top skill, 2)
Piloting/'Mech: +5 (Table-top skill, 3)
Small Arms: +5
Tactics/Land: +4
Mix'n'match the rest.