Well, let's go for some stereotypes.
About 33, looking slightly dishevelled, knackered car out front, probably a doctor or nurse.
Floppy hair, mountain bike and trailer for kids out front, crinkles round the cheeks just below where the sunglasses go, about 39-42 - A&E Bike Bro/experienced Reg or fairly new consultant.
About 50 but unsure as he looks very young at the same time, natural tan, perfect teeth, expensive watch, shoes and gloriously impractical red Alpha out front - probably senior consultant. Confirmed once he gets onto the subject of obscure Delta Blues musicians or mentions they're driving down to a place with boats that isn't Dover over Easter.
Looks like normal person, normal car, clothes from generic stores, relaxing without a care in the world whilst the kids tear lumps out of one another under the pretext of playing Star Wars or football - more likely reception.
Built like brick shithouse, tends to automatically offer to carry things or help set the bouncy castle up with A Look that can stop squabbling children dead in their paces at 30 foot - security or nurse practitioner.
Sits at back with the unerring ability to spot who has a bad back, who has hayfever, who isn't looking right and needs to be guided into a chair/doctor called or seamlessly manoeveures the pushchairs, buggies and deliveries into impossibly small spaces without a single dink on the doorframes - Porters.