Actually the age thing is a myth. According to the NSA all ages are as susceptible as normal percentages - it just happens that older people die just as they do without Covid. There is also an indication that BAME people are more susceptible than Caucasians - again as they are about 20% more liable to suffer from diabetes and high blood pressure.
Our release from Lockdown will be to restart the economy and businesses first - no social areas will open. Businesses will be told to practice distancing as much as possible in the hope that that will be enough to hold the infection rate down. Age won’t matter, but it would be sensible to keep retired people at home, out of harms way as such.
In my opinion, flying will be severely hit by ‘sanitisation’ enforcement - especially international /cross channel flights. Health Certificates, Baggage sanitisation, Airport equipment cleaning of Scanner trays, etc...Card payments only, distancing in seating and shops - no restaurants - and so on.....