I think it probably had more to do with appearance than actual age. So a 12 year old who looked big and mature for his age would probably be more likely to be considered a man's age rather than a 14 year old who looked small and scared.
I agree. I recall reading that Jack Ryerson, 13, belonged to the latter category and might have been the reason why Lightoller relented after his intial protests. I have no idea what 11-year old William Carter Jr looked like but his mother mght have used the girl's hat as a precaution.
I believe that the Asplund survivors got on board Lifeboat #4, but quite late in its loading. Selma Asplund got in with Lilian and Edvin Felix but Carl Sr remained behind with Filip (13). Clarence (9) and Carl Jr (5). Whether Lightoller actually stopped Filip from entering is not known but his father might have thought so after seeing the loading policy. IMO, the younger boys were just too scared to go and Lightoller, who would have allowed them if they had tried to board Lifeboat #4, simply did not wait for them. But he would never have allowed Filip Asplund to get into the boat.
Rhoda Abbott could not leave the ship with her son's Rossmore, aged 16 and Eugene, aged 13
True, but not because the boys were actually
stopped from entering any lifeboat. The Abbots got to the
starboard side of the boat deck where Murdoch was allowing even men when there was room. The following excerpt from an article about Rhoda Abbott by Robert L Bracken gives the impression that someone stopped Eugene and Rossmore Abbott from entering
Collapsible C, but IMO that conjecture is misleading.
They finally reached one of
Titanic’s last lifeboats,
Collapsible C, just as it was being loaded. Only women and children were being allowed through a group of crewmen responsible for loading this boat
AFAIK, although there was some chaos around Collapsible C, there was no 'cordon of crewmen' around the lifeboat like there was on the port side around Collapsible D a few minutes later. The Abbots arrived late into the sinking, probably in company with Amy Stanley, who occupied the cabin next to theirs. Amy Stanley herself shared a cabin with Virginia Martin & Elizabeth Dowdell and left with them on the way to boat deck; the reason that they got separated might have been because Stanley went forward (and towards Collapsible C) with the Abbots while the other two went aft, but all of them remained on the starboard side.
According to Amy Stanley, Rhoda Abbott was put off by the noisy crowd around Collapsible C and so remained on the deck with her sons, probably some distance away. Bruce Ismay testified that he checked to see that there were no women or children around before entering Collapsible C himself at the last moment. Later, the Abbotts remained in the vicinity while the crew were making an effort to free and launch Collapsible A. That was unsuccessful and when the 'wave' hit, lifeboat floated free. Rhoda and her sons jumped into the water to try and get to it (as did several others) but only she came up to the surface; Eugene and Rossmore were lost in that icy melee.
We must also look at it from Rhoda Abbott's perspective. Here was woman who was running away from an abusive husband with their teenage children, only to lose them both under traumatic circumstances while barely surviving herself. If she thought that Ismay or anyone else were indirectly responsible for her sons' death by not allowing them into Collapsible C, she would definitely have said so afterwards. AFAIK she did not, which suggests that the Abbotts either arrived a trifle too late on the boat deck or Rhoda did not follow Amy Stanley though the crowd into the boat because of her own anxiety.