Is 11 yrs age difference too much

Depends on the ages. It is too much if one person is 11 and the other is 22.

Can you please give more details?

Well it defiently depends on the ages of the two.
But if you are any younger than 18 than I would say yes.

Well from my point of view I don't think its has any impact on the age unless you love them or not..
I know these couple that have a 20 years age different but they have been together for around 2/3 years now!