I'm 56 retired and still enjoy working with Arduino. I just recently purchased a Prusa 3d printer and am really enjoying learning it along with fusion 360. That said it really requires having a goal in mind, as it is more difficult to just sit down and learn to make an LED blink. There is a Make book called making things talk that starts out basic but gives lots of ideas on ways to use Arduino in useful ways. Making Things Talk: Using Sensors, Networks, and Arduino to See,... https://www.amazon.com/dp/1680452150/ref=cm_sw_r_sms_awdb_t1_TngvDbVTQ4STT
Hope that helps!
Oh yes, i did enjoy lots of Unigraphics and I-DEAS! It was a time well spent, 1000s of hours just flew by especially trying to figure tasks/projects with very complex surfaces and NURBS math.
I also played with many Tariq's books - a mix of math, graphics, coding and art.
https://www.amazon.com/Tariq-Rashid/e/B01N1YH9L9/ref=dp_byline_cont_pop_ebooks_1
And projects in this book were also amazing - deeply technical and creative.
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Ah, if just the pain was not so distracting.
And it is not only pain per se. I've got easily depressed and losing an interest to everything, except bare basics. I remember something similar happened to my mom in her fifties. She just lost interest in many things because of exhausting stomach pain. Eventually she had to live with this pain for 35+ more years. I'm so afraid of similar scenario.
I'm always puzzled to read stories here about positive attitude and energy. It feels like we're both in the same boat, and we're not. Like they're having energy or brains or character to outsmart or just overcome the pain, and I don't have it. Is it low pain tolerance? Predisposition to depressive states? I don't know.