This issue is largely, (but not entirely) based on Statistics. Again, largely, based on Heart attack type issues. Generally, the risk of a health issue such as a heart attack, increase with age.
The airlines have always preferred the certainty given by a set age. If this goes forward as a case, the law will probably change, and the airlines will have to start assessing individuals more closely.
All commercial pilots should then expect even more scrutiny about their health for license renewal.
Some 60 year olds will lose their license. Some 69 year olds will keep theirs.
Such is life. Lots more work for the medics at the Belgrano.