- Georgo2112April 2013
Here, as far as my knowledge goes-
" Many " is used for countable nouns..." Much " is used for uncountable ones...Years can be counted...so using ' Many ' is appropriate, I think ...How many years is he/your brother younger to you? How many years are you older than him/your brother?
I think "How much older are you" is correct, but you can also say "how many years older are you?"