So a Time Lord has 13 lives...

So a Time Lord has 13 lives and the Doctor is on his eleventh regeneration by the time of Matt Smith so their is only two regenerations left at the time that he melded himself with the ten regenerations that River Song had left over, so does that get The Doctor twenty one or twenty three.

Well how many regenerations did River Song actually have I thought she was on her third, so then ten given to the Doctor, as the first regeneration was after she was shot by Amy, River Song as a young child/the one below that has got a crack in her helmet. Then she regenerates into her second form which is the one to the right hand side of the previously mentioned  picture but then her next regeneration is triggered by the gun that is shot by Hitler but their wasn't any contact between the bullets and River; was their? As I can't see how the bullets hit her didn't Hitler shoot all of the bullets at the Teselecta unless he was a terrible shot which it didn't look like  as the Teselecta seemed to take the brunt of impact of the bullets that were being shot at him by Hitler, so how and why did she actually regenerate into the one that is River Song from the day of the Tenth Doctor and from all of the after episodes.

But then within River Song short on screen life it looks like a Time Lord can influence their future regenerations by thinking, and they don't age at the same rate as us they each seem to have a personally independent growth rates, as River number 2 Says she's focusing on a dress size and then she goes and transforms into Alex; the top one on the the picture. But from the first generation of River Song as she was a young girl in her first form 1969 (the year of the moon) but then we see at the end of that episode we see her regenerating but we don't know what year that regeneration place in all we know is that it was in-between 1969 and Amy Pond's/her mothers birth but then she'd be having to live in that time stream for 24 years until She can go to school with her mother, and then she'd have to re-engage her growth hormones to get her to act as if she was the same age as Amy, then.

Conclusions I have gathered from the above case study are that Time Lords can control their regenerations to a certain extent and they can also control the speed at witch they each age, or was that just River Song that can do all of those things?