This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Suppose the present day is 1 January, 2015 so day before yesterday must be 30 December,2014 and on that day she was 7 years old suppose her birthday falls on 31 December so on next day she'll be 8 years old and in the present year she'll turn 9 so in the next year she'll be 10
1 5 1
Because his birthday fall on 29 February. So on a 28th February of  leap year he was 7 year old but on next day ie 29 February he become 10 year old as leap year
Comes every 4 year.