Only partly agree. Even adults are very conservative. A bunch of forever-40 wouldn't work very well. Luckily this can be fixed. Experimental brain plasticity drugs also increases forgetfulness, which is what we really want. Knowing the old ways of doing things means that new ways won't be explored.

i think there is a subtle difference between being conservative and being experienced.

experience gives, sometimes false, impression of knowing with some degree of certainty that a certain direction is wrong or won't yield results. young people don't have that bias.

conservatism is instead aversion to even agree with the results themselves if they don't conform with one's worldview.

this is pure speculation on my part though.