Many people are saying that they are fit and healthy, regardless of age. However, your immune system is less effective as you get older, therefore you are more likely to be seriously ill and die even if you don't have underlying health conditions. If you have a husband, you also have to bear in mind that that proportionally more men are killed by the virus than women, so consider his risk if you choose to stop isolating.
When the lockdown lifts, it is going to be a matter of individual choice. Do you want to risk it? No-one is going to lock you in your house. Personally, I dread being separated from my family for so long but I will do it, because I want a future with them. Sometimes I feel a sense of panic at the thought of months of separation, but I calm myself down by thinking that I am doing this now to give myself and DH a chance to see the kids grow up.
Obviously the virus hasn't gone away. The death rate is gradually decreasing because the lockdown is working, not because the virus is less. I think we need to give the scientists time to find an effective treatment, and not become collateral damage along the way.