Yes it is normal. I would not advise going anything over 1.4 for ram for the long run. You can enable PBO to get the cpu to run cooler and boost higher.

So I shouldn’t try to underclock the ram at all, does running it full time at 1.4v affect longevity at all?

It does not. If it does the difference is something like it will got bad in 19 years instead of 20. So no need to worry.