Absolutely, you can get it later in life.
Long term Prednisone use leads to fluid gain. For me, Prednisone is used short term, while waiting for long term drugs to kick in (some of the preventers take a while to start working). Whenever I've used Prednisone, the relief of being able to breathe easily has outweighed any possible weight gain worries.
Asthma medications can basically be divided into 2 categories relievers (you take them during an attack) and preventers (you take them regularly). Often the first treatment is with regular use of a reliever. As far as I know, weight gain is not a side effect of reliever puffers (like MSTIGGERFAN I have had a racing heart from one and if I take too much, I get shaky hands).
My asthma is pretty much under control. I still carry a reliever puffer with me. If I have an attack, I take the reliever. If I start to have regular attacks (usually induced by a cold, allergy or the weather) I take my reliever 4 hourly. If it's still no good, I take myself to the doctor and usually get a script for a preventer (or sometimes prednisone depending on the doctor's opinion).
As for seasonal asthma, mine tends to occur in winter. We have dry winters here and I struggle with that. Flowers in spring can set my off too.
Sorry for the long post.
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