Unfortunately yes it is. However there are some options to extend your career by flying partime. E.g. fly 80% from age 40 and you retire at 62. Other variants are also available. In my time the only option was to fly 80% from age 48 in order to extend your career from 56 (at that time the retirement age) to 58, hence my recent retirement at 58. This young retirement age is a union thing creating a somewhat predictable and steady flow thru to Captain positions for young colleagues. When you are young it’s great, when you are old and have to leave the job and company you love it’s not so great. Many retired KLM pilots continue their career at other airlines all over the world and the sad thing is that KLM had to ground several airplanes this summer due to lack of pilots.