Roth IRA conversion

I have before tax and after tax contributions in separate IRA's that are more than 5 years old. I want to convert part of the before tax IRA to a Roth IRA. I am 60 years old.

1. Does the pro-rata rule apply in this instance?

2. Does the 5 year rule apply to the funds converted to the Roth IRA?

3. Any other considerations?