At Autscape this year we had a lecture on the subject of ageing, and how we seem to become invisible as we get older.
The lecturer described how things may well follow a bell curve over a lifetime, giving occurrence of meltdowns as one example.
They may be quite frequent in young years, lots of exposure to the stressing sensory and social triggers (at this point my own thoughts added the observation that one also has only limited control of the situations)
Middle life, less frequent or severe as one teaches oneself ways to cope (and my own thoughts that one may be more in control of ones life and able to avoid some of the situations or environments which give the stress and overload)
Older year. resilience falls of generally as bodies start to age and wear out. Older brains less adept at filtering sensory stuff, it takes longer to recover from anything (just a general feature of getting older and starting to wear out). Also (personal thoughts again), one may become less in control of ones life, for example having to make use of carers, perhaps having to move into some sort of residential care (potentially stressing social and sensory demands coming back, from which escape or avoidance is not an easy matter).
Ones autistic profile may be fairly constant but the ability to deal with sensory or social demands varies throughout life with the external situations, the amount of control one may have, and the effects of aging generally.
Slides from the Autscape lecture :
http://www.autscape.org/2018/programme/ ... 0older.pdf