Your dh has retired from paid employment. Great! But he hasn't retired from being a parent or a partner in your lives. (however much he might think he has)
Your pension has suffered so it's great that he has retired from work, he can do more at home and you can do more (employment wise) to cover the pension gap. Maybe you need to do some extra studying? Maybe you need to change job and have more commuting hours and leave before the pack lunches are made, or take on more responsibility be less available to cover any emergencies.
Surely that's about being a partnership over the long term? My comments above are a bit tongue in cheek, but they have a serious point. Please, please do not talk yourself into continuing to be the 'default' parent. You are both parents. Now is his time to step up in a different way. Both for your dc and domestically.
Devolve a whole task to him e.g. laundry. Washing, drying, ironing, putting away. If any item of school / sports wear is missing, it is up to him. You do not rescue the situation. He can do those things anytime, morning noon or night, doesn't interfere with golf or cycling, he just needs to be organised.
Or maybe the food: meal planning, shopping, cooking, clearing up, freezer management etc.
You are still working so you can maybe pay for a cleaner to cover your half of those chores.
Life admin: you leave him a list. "Honey the car insurance is due for renewal - here's the paperwork, can you sort it this week while I'm working".
For important dc things (concerts etc) you sit down with and say 'Patrick has a swimming gala next month, with 4 practice sessions, how will we split that between us. btw I've got a meeting on x date so you'll have to do that one.
You need to be right on top of this. In advance and then once his 'retirement' starts. Of course he can play golf, but only on a Tuesday or Thursday when you can be around for emergencies. If you have to, arrange to work away from home for critical periods - even if you're only going to the local library. Get out of the house so he HAS to parent.