Is it normal that a boy starts talking about 2 and a half years of age

Seems normal to me. Even though I had a speech problem and didn't talk at all until I was 3, I turned out fine.

That depends on what you mean by 'talk'. If you were entirely mute as an infant, yes, that is sort of odd. But if you engaged in the normal babblings and vocalizations of babyhood, but did not start using actual words until 2, it's actually spot on, especially for a boy. However, if you were basically mute until you were two, that is sort of odd. At two, did you start using words, or were you just engaging in baby style babbling (ma ma ba da da, etc)?

are you saying coherently or a random mash up of words.

I was 10 months when I began talking. Im not sure what the average age is...

i started really late as well, my parents were worried that i didn't talk at all so they brought me to a speech therapist.
20 years later and i still don't really talk at all cause i have nothing to say, i probably didn't have anything to say when i was younger either and could probably talk perfectly fine.

Like charli said, it's a bit late, although I don't know too much about it. I started much later than you did, and I'm alright...I think:P.

It's a bit late, but some kids start later than others, some earlier. As long as your progression was ok and you have no difficulties, no biggie. Especially as this is (presumably) some time ago.