Decision guides for people spending their own money. What the evidence supports at each age, what to ask before booking, and how to tell a serious programme from a well-photographed one.
None of these require medical knowledge to test. Every one can be checked from a clinic's own website before you speak to anybody, and most of the category fails at least three.
Most guidance on this stops at a lipid panel. Most private programmes start several thousand euros past where the evidence runs out. Here is the sequence in between, with what each test is worth.