Introduced at 15 months, had no insterest what so ever to learn until he was 2.5 years, and was potty trained before his 3rd birthday.
With potty training you have windows, you can't push those windows of opportunity either. You can introduce it now, and you may either have a child who gets really interested in a week or a child who could care less.
I started with my daughter at 20 months, she was fully potty trained by her 2nd birthday. She would go pee in the potty almost right after I started potty training her but I couldn't get her to poop on it, finally on her second birthday she did and she did ever since. I used the little plastic toilet it also detached so I could put it on the big toilet and I'd let her use it like the as well whenever she wanted.
started my daughter around 1 and a half because seh showed some signs of potty training like her diaper was dry most of the day and she seemed to want to be out of diapers she started going on her little potty then something happened at her day care and she refused to go potty till 2 then she was fully potty trained by three my son i started at two and we are still working out the accidents
I introduced my DD to a little plastic potty at 15 months just so she could see what it was, and then around 2 we started potty training on the big potty with one of the potty seats! She will be 3 in March and has been potty trained completely for the last month! Good luck when you start!!