About the positive: I think LU was saying that it is nice that you are acknowledging the positive qualities in being single right now.
Based on my reading, LU was not advocating for being voluntarily and complacently single or staying single forever without working on yourself and finding your partner.
One benefit for someone who has remained single until his/her 50’s is that this person will hopefully appreciate his/her spouse much much more when they’re married, as well as be ever grateful for Ha Kodesh Baruch Hu.