you are too old if you take longer than the suggested time to complete your degree without a good reason other than that you just wanted to chill and drag it out
if you continue on to do an advanced postgrad degree thats different but then also depends if you are doing it just for the sake of doing another degree because you cant grow up and face real life.
plus if you are old you cant pick up chicks at uni, cuz you are old and poor and got no game.
nothing sexier than like a 29 year old b.arts student who is now doing a second bachelors degree in psychology or somesht.