Sorry if this is an ancient solved problem to ask in 2019, but I googled about this and Quora isn't really answering me. I searched for the words black and race and politically as key-words on this website but still not a satisfactory answer.
The setting is 2013 in the UK, and my character is approaching three people two of them are sitting on a bench in a garden and one guy who is an elderly black man is standing.
As my character is approaching them, my novel reads;
I walked towards the trio who looked like they were having a conversation. They all seemed welcoming. A teenage looking girl and elderly women were sitting on the log and an elderly black man was standing in front of them.
I don't want to say it as black man and I am not sure of using the word African (will that clearly indicate without being broad). I want to express this just to mention the diversity in that environment although later on in my novel I have clearly expressed him in detail.