I don't think I can do such a thing but I guess it depends on personality and character. There are those guys  who are older but without character & integrity whereas there the younger guys who what they have in them is far better than 10 older guys put together. It also depend on the understanding and maturity of the individuals involved.

If I may ask what type of engagement are u talking about?

It depends on so many things mostly maturity both physically, emotionally, psychologically, financially, healthwise, spiritually etc. Marraige is something you can rush in but can't rush out, so you have to be very careful. I can say there is a right age for marriage because if I should say maybe 24, some culture will query that so it depends on the parties involved.

But in all things, we shouldn't be forgetting someone that is very crucial i.e. talking to Our Heavenly Father about everything even about what age we should go into marriage (I mean individually asking Him).