Why do you suppose the MSLA changed from a 25-year to a 30-year term for the annuity

Question:

Why do you suppose the MSLA changed from a 25-year to a 30-year term for the option?
Annuity
An annuity is a series of equal payment made at equal intervals during a period of time. In other words annuity is a contract between insurer and insurance company in which insurer make a lump-sum payment or a series of payment and, in return,...