I felt that that many would be confused by the character's ages.

In their third life,

Dante died at nineteen and the rest of his friends were 18-19 years old. 

In the fourth life,

Dante is fourteen years old and his friends range from 13-14. (Progressively by 5-10 chapters, they get older. Towards the end, Dante is 18)

This is the birthday of the friend group and oldest to youngest in order.

1)Micheal - March 31st

2)Crissie - May 16th

3)Dante - June 10th

4)Noah - October 11th

5)Fox - November 30th

6)Evangeline - February 2nd (She is born the year later)