Lindsay and Leena are the youngest of the OGs (been there a few years). Leena is in her early to mid 30s (about 33/34). Lindsay is in her early to mid 30s too (about 32 to 34). Lindsay looks younger but may actually be the same age as Leena (maybe even a year older, though unlikely). Beatrice is in her mid to late 30s (I believe about 37/38). Courtney Heels is the same as Bea. Kayla is mid 30s (about 36). Jen is in her early 40s (about 43). Ironically, Lindsay and Leena are their two best anchors outside of the Morning Show team (Nick and Jen - Bakari is probably their best anchor in terms of rapport with fellow reporters, hes very relaxed and can always get a laugh out of the field reporters but is not quite as smooth reading the news like Lindsay and Leena) and Courtney and Bea are there two best field reporters (and are around the same age as well)
Of the newcomers, Melissa is late 30s. Sijia is the hardest to tell. She may actually still be in her late 20s. She carries herself with such grace and poise I would imagine older but she seems to be at oldest early 30s, which would make her the youngest of all the reporters. It would make sense as she does still seem a bit stiff and overly formal, just like Eden was (when doing the news, she was great at weather - who was also their youngest when she was with them), which may just be them needing more time/experience to develop a more relaxed but professional style like Leena, Lindsay, Bakari etc.
Lindsay and Beatrice are still my favorites but damn Sijia is really gaining on them!