We are retired, I am 60 and DH 69. We have been married for almost 40yrs.
Apart from holidays and weekends we have spent our working lives apart from 7am-6pm and sleeping from 11pm-6am. So that's a total of approx 6hrs a day awake and together for nearly 40yrs. That is a massive difference to the 14+hrs a day we spend awake together now.
We are very different people but we have a happy, calm life. One of our boys is home now (at work) after graduating and one is still at uni. DH is kind, considerate, chilled, interactive, helpful, decent and honest. BUT he cannot sit still for a minute! He drives me nuts. He's always fiddling around with something, or making tea, or putting rubbish out, or wandering about looking for something.
I always love him, sometimes adore him, sometimes want to throttle him. Thank goodness for both of us that his hobbies (birdwatching and photography) take him outdoors 2-3 times a week for whole days. Thank goodness we have the space to remove ourselves for a bit of peace if needed.
We have learned a lot more about each other in the past 3yrs that's for sure. Learning to be retired together and acknowledging each other's needs has been a learning curve for both of us. And yes, we bicker a bit more than we did when we were both busy and at work, but we also enjoy the slower pace of life and the freedom.
I think the secret to retirement is to keep up with friends, find hobbies, and make time for ourselves, together and separately. On weeks where we are home a lot, or he can't get out because of the weather we are definitely snippier over the small irritations.