I’m in my early 70s. I know many people in their 60s and 70s who are far more capable of raising children than are many members of the snowflake generation.
Many grandparents in their 70’s are basically raising their grandchildren.
There are millions of grandparents in this country raising grandchildren due to the chaos that results when irresponsible unmarried people have children.
I don't see why the age of this couple is relevant to the situation.
Really?
My guess is that most 70 year olds probably don’t have the energy required to do so. Even a lot of first time mothers in their 40s struggle with taking care of toddlers.
If you can, that’s great, but I doubt that that is the norm.