I first thought it would mean "Are you as old (or big) as me?" because there is no 'daha' in this sentence. Well, now, knowing that 'daha' is optional I am curious how you'd say 'equally old/big' or 'as old/big as me'. Does this work with 'benden' as well in this case? Sry, maybe I was missing out on some previous sections that clarify the difference.