Answer:

older

Answer	Crossword Clue
OLDER	Born earlier (than)
OLDER	Been around longer
OLDER	More mature

OLDER	Wiser's partner
OLDER	Like the better sister (take that, Lindsay Lucido!)
OLDER	More seasoned
OLDER	Like a big brother
OLDER	Probably wiser
OLDER	More advanced
OLDER	Wiser, maybe
OLDER	Senior

OLDER	More established, say
OLDER	Something you get on your birthday?
OLDER	Not as up-to-date
OLDER	Born earlier
OLDER	Not so current
OLDER	.. but wiser
OLDER	Having gone around the block more
OLDER	Like mentors vis- -vis mentees, usually

OLDER	Plus another birthday candle
OLDER	More out-of-date
OLDER	More antiquated
OLDER	... and wiser
OLDER	Born first
OLDER	Wiser partner
OLDER	"The ... I get, the better I was"
OLDER	Not as trendy

OLDER	Like Bart, vis- -vis Lisa
OLDER	More advanced?
OLDER	More senior
OLDER	Like mentors, generally
OLDER	Longer in the tooth
OLDER	Wiser companion
OLDER	Not so new
OLDER	Born before

OLDER	Not as fresh
OLDER	Like big brothers, say
OLDER	More familiar, as a joke
OLDER	More familiar, joke-wise
OLDER	Like Venus, to Serena