They'll probably be OK, but I always give them a good clean and condition with Saddle Soap nicked from the wife's horse collection.
The leather does come back to life again after a once over with this stuff.
Did you ever hear anyone say “That picture had better be banned, because I might look at it and it might be very damaging to me”
+1 on the saddle soap and wax products
I have used it on a leather sofa and my second hand bike jacket and it did the trick in both instances
£11695
£11916
£11216