heavier cues stroke straighter and do more of the work
What I have always found is that the weight of my cue had more to do with my skill level than my age.
As a beginner I used heavy cues. Then I favored a 19oz cue. 18-19 ounce cues are the lightest of the "heavy" cues in my opinion. For reasons I don't understand, three times the weight of the cue ball seems to make the hit effortless, under that I have to start doing more of the work and my strength is moving the cue ball around rather than the weight of the cue and gravity.
As my skills increased I went down through seventeen and even fifteen ounce cues. Finally I was playing with a 60" 12 ounce one piece snooker cue. Introduced me to low deflection before low deflection was cool! I had to learn how to aim all over and this was the hardest stick to play with I ever touched. Took a couple months of frustration trying to move pool balls around with this little twig. Seemed I had to do every bit of the work with muscle. Truly annoying to play with. When I finally got a handle on it I played the best pinpoint position I ever played with it. Perfect speed control and I had a milk dud on it back in the eighties. Took a lot of effort to make the stick work but the result was ridiculously precise position play.
No scales so I have to guess the weight of my cues now, one is around seventeen ounces, a sixty inch cue. People trying it rarely notice it is long, they instantly notice it is light. My other cue is around 19-20 ounces, 59" with the thirty inch shaft. Rarely getting to a pool table these days I struggle with the light stick sometimes. Swapping to the heavier stick improves my ball pocketing. It has a wrap too where the other stick doesn't. I sometimes use a slip stroke with the heavier cue which can aid accuracy on some shots or when out of stroke too.
With the cloth and cushions on today's tables hard to imagine anyone needing more than a 19 or 19.5 ounce cue to move balls around. A heavier cue seems to straighten out a stroke though.
Many years ago I played around with a cue gradually adding weight to 26 ounces then jumping to 32 ounces. Over twenty ounces cue ball contact was barely felt, 26 ounces was hard to have any finesse at all with and 32 ounces was ridiculous.
My guess, the perfect lifetime cue for most people weighs 19 to 19.5 ounces and is 60" long. I have a lot of wingspan and a lot of shots I seem to run out of cue with a shorter cue and that extra couple inches gives four more inches of playable area without a bridge, two inches all the way around the table. Doesn't seem like much but it comes in handy on the nine foot and bigger tables. The only longer than 60" cue I played with had the extra length in the shaft. It was a noodle, made an old moochie shaft seem like a crowbar. Shaft was just fine when I cut it down to thirty inches.
I suspect the insert style extensions that seem to be the fad at the moment are making people play better at least short term because of the weight increase more than the added length. A couple extra ounces steers a lot straighter for whatever reason.
(found some scales, my light cue is 16.5 ounces, my heavy cue 18 ounces if the scales are right.)
Hu