Well, “age” in industrial culture is rarely modeled after healthy phsyiological examples - we rarely see self-cultivating/self-healing rejuvenating elders - and that’s something to keep in mind. For me, it’s been very meaningful to find radiant elders who I admire and install them as role models.mentors/examples in my inner life, and also to learn of interesting historical people who aged well through self-cultivation, fasting, and such (Romainian keto researcher Cristi Vlad’s bookPeriodic Fasting: Repair your DNA, Grow Younger, and Learn to Appreciate your Food certainly has many gems in it. I do think that DNA repair is hugely in one’s favor on the the LCHF/keto journey - and that like others have mentioned - it can take a few years.
I think in addition to the collagen a few times a week (I put it in smoothies in summer, and in bouillon in winter) we need to be mindful about Vit. C levels, as collagen uptake requires a level of Vit. C in the body. I supplement with berries or a liposomal Vit. C capsule on the days I’m taking collagen. Apparently dried berries of various kinds (wolfberries, pomegranate seeds along with sour cranberries and wild blueberries in some areas) and even dried fruits were prepared and stored and traded by our ancient ancestors - as a zing of Vit. C/sour taste is so nice on the fatty palate! Just a zing though, considered precious & rare - not handfulls and not for grazing!!!
Also can be fascinating and beneficial to look at HGH levels. My understanding is that HGH is nicely enhanced with well formulated IF and with the mitchondrial enhancements of intense slow resistance weights strength training 1-2 times per week. It’s also enhanced with certain glandular workout yoga (kundalini) and some other kinds of mind-altering chi gong and some traditional dance practices.
Another aspect is our gut absorption. Someone switching to LCHF midlife may well have digestive sluggishness and or long term congestion or microbiome imbalances that interfere with absorption of nutrients and would benefit from spices that enhance digestion or by supplementing with ancient restorative superfoods such as Ginger (easy to take via capsules).