A couple of years ago, right before my 58th birthday, I saw this posted on HN. 
<a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=6640430" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=6640430</a> 
It says more than I can, but I will add one thing. At about that same time my company hired an engineer a year older than me. He&#x27;s still doing a great job. I&#x27;m not in precisely the same business as you, but it&#x27;s close enough that I still read HN.