As I understand it, from the employer's perspective there are age rating differences in premiums. I know that is true in the small group market. Many large companies "self insure" only hiring insurance companies to "administer" their plans, in which case age rating is a mute point. However, at least for COBRA everyone gets the same price regardless of age, which is why COBRA tends to be a great deal for older individuals and a horrible deal for the young.
While 3:1 was the old ACA federal default age rating ratio, and the current bill proposes 5:1 as the new default, states can override that. New York and Vermont use a 1:1 ratio in both the individual and small group markets.
States also vary in the maximum tobacco rating ratio. Not every state follows the ACA's 1.5:1 maximum tobacco rating ratio. (I don't think the current bill tweaks that.)
Note that these are all maximum's. I know of at least one insurance company in Maine that does not charge extra for tobacco usage. I also believe there is no legislative requirement for an insurance company to charge older individuals more when setting their premiums. Though obviously if one company didn't age rate while all the others did, that company would become a very expensive option for young people who could presumably get a better deal from companies which do age rate.
Here is a link for more details on
State Specific Rating Variations.
While I have enjoyed the ACA's 3:1 ratio and would now obviously love a uniform 1:1 rating for all health insurance, I also remember when I paid $25/month ($74/month in 2017 dollars) for health insurance as a young man, back when women paid more, underwriting controlled if you could get insurance, and pre-existing conditions were not covered.
My current thinking is that having no age ratio limits is probably reasonable. I prefer the free market when possible. However, assistance for those who have difficulty affording insurance must take differences in premiums into account. The current bill doubles the credit, but premiums can be five times as great, that combination seems problematic. However, from a CBO headlines perspective it makes total sense. It is cheaper to cover young people than to cover old people, but the CBO headlines will simply be about how many people are covered. If you gain two young adults at the cost of one old adult the coverage numbers have gone up. Despite hurting my personal situation, I'm not sure that is a bad thing.
I was shocked to learn
Nearly Half Of U.S. Births Are Covered By Medicaid. However, I definitely want society to insure children (and fetuses) have health care coverage before they are old enough to work. While I'm not certain we should also choose between having society cover 20 somethings versus 50 somethings, if we have to choose covering the 20 somethings may be the wiser choice over the long-term.