If my math is correct, that will take your AAoA from 4yr, 9mo to 4yr, 8mo. Shocking difference, I know. 
It may vary by how whatever interface you're using rounds to which month, however with that many accounts having such a close age to each other you're going to experience almost no change.
@Anonymous wrote:Hello, I was just recently approved for a Chase saphire preferd and was wondering how much this new cards going to lower my credit age, below I will list all accounts open and closed with a date open currently it says my AAOA is 4 years 12 months and my oldest account is 6 years 7 months.
1. 6 years 7 months.
2. 5 years 12 months
3. 4 years 11 months
4. 4 years 10 months.
5. 4 years 9 months
6. 4 years 9 months
7. 4 years 9 months.
8. 4 years 9 months ( closed )
9. 4 years 9 months ( closed )
10. 4 years 9 months ( closed )
11. 4 yers 9 months ( closed )
12. 4 years 9 months ( closed )
13. 3 years 5 months
14. 3 years 3 months
15. Just opend this month/ not showing yet.
Just
1. translate each to # of months
2. add them up
3. divide by 14 that's your before number
4. divide by 15 that's your after number
@Ficoproblems247 wrote:If my math is correct, that will take your AAoA from 4yr, 9mo to 4yr, 8mo. Shocking difference, I know.
Actually, it would go from 4yrs, 9mo to 4yrs, ~5 months. So a 4 month difference.
