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The numbers go way up in the relative sense but are still quite small in the absolute sense. Evolutionarily speaking I think the differences are irrelevant.

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Evolutionarily speaking, the dangers of having older parents are definitely dwarfed by the fact that older parents just tend to have fewer kids.

Cultures that encourage starting families at 25 will genetically dominate cultures that encourage starting families at 35.

Even though I agree with you, I would like to point out that more experienced and stable parents could be enough of an advantage to balance the benefits of having younger parents. Especially for fathers that have already a settled career and more time to invest in their offspring.

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