If I have $8000 to put in Roth IRAs, is it better to split it equally between mine and my spouse's, or max one of them out and put the rest in the other?
Roth IRAs are not subject to a Required Minimum Distribution, so any difference in age will not affect the investing outcome. The older member of the couple will be able to access the funds sooner without penalty, however.
Edit: Note that inheritance upon death is also unlikely to make a difference because of the lack of a minimum distribution. There are rules that must be followed in that event, but in most cases there is no tax on the rollover. More information is available here: