Here are links to two recent articles about the benefits of cycling for us seniors:
https://www.nytimes.com/2018/03/14/well/move/how-exercise-can-keep-aging-muscles-and-immune-systems-young.html?rref=collection%2Ftimestopic%2FElderly&action=click&contentCollection=timestopics®ion=stream&module=stream_unit&version=latest&contentPlacement=3&pgtype=collection (https://www.nytimes.com/2018/03/14/well/move/how-exercise-can-keep-aging-muscles-and-immune-systems-young.html?rref=collection%2Ftimestopic%2FElderly&action=click&contentCollection=timestopics®ion=stream&module=stream_unit&version=latest&contentPlacement=3&pgtype=collection)
https://www.theguardian.com/lifeandstyle/2018/mar/08/cycling-keeps-your-immune-system-young-study-finds (https://www.theguardian.com/lifeandstyle/2018/mar/08/cycling-keeps-your-immune-system-young-study-finds)