There is no mention of being retired in your link or indeed of elderly adults being more at risk of contracting CV and their need to remain at home. Bare in mind that 70% of those who have died from the CV in Spain are over 60 years old. I believe it is similar in Italy. Hold that figure in your mind and you will realise how vulnerable older people are to the CV, not expressly older people as the virus has claimed the lives of younger people as well, but older people i.e. over 70 years old and those with under lying medical conditions are seemingly so much more vulnerable and make up the bulk of the figures for people who haves sadly lost their lives. But if you are retired and over 70, that you believe you are in the peak of fitness and health, if you believe that if you contract the CV you have as good a chance of recovery as a much younger person, then you carry right on ignore the advice.
So when have those over 70 years of age been told to remain at home? Surely you cannot have missed Boris and his medical advisors making clear on several occasions during their nightly updates on TV that those who are 70 years old and over should remain at home isolated for 12 weeks? If you are 70 years old and over you are typically going to be retired, however some people still may still be working, I accept this. Indeed some younger people may have been lucky enough to be able to retire well before 65 years old, but for the most part those who have reached 70 years old will be retired and classed as vulnerable and even more at risk to CV.
Younger family members have also been told NOT to visit elderly parents or relatives. For Mother's Day the advice from Boris was NOT to visit your mother and potentially pass on CV to her or indeed your Dad, but to call or use Skype or similar. Younger people can be carriers without even being aware especially if they have not been tested and unknowingly pass the virus onto older family members.
I also have the impression that many contributors to this forum may well be retired or approaching retirement age so I am stirring ups hornets' nest. Not all contributors here are retired, many like me still work, but there are quite a few.
I hope this helps clarify things for you.