That's going to depend wildly on the actual child (my eldest is ridiculously responsible so we'll probably go out when she's younger, maybe 10).
I really don't think people are focusing on how busy lives will be in 10-12 years when they decide whether or not to have children. Obviously things like finances and childcare when they are young are way more important. Kind of insane that we're even debating that.
The NSPCC says 12 is a minimum for leaving kids alone at home: https://www.gov.uk/law-on-leaving-your-child-home-alone
That's going to depend wildly on the actual child (my eldest is ridiculously responsible so we'll probably go out when she's younger, maybe 10).
I really don't think people are focusing on how busy lives will be in 10-12 years when they decide whether or not to have children. Obviously things like finances and childcare when they are young are way more important. Kind of insane that we're even debating that.