I am 55 and I've seen interesting job offer for administrator. But I don't know if to apply for it. Am I too old for this?

Good morning! I want to work as administrator in the beauty salon. What is the most important for this role?

Administrators perform a multifunctional job. Their jobs entail managing, coordinating with managerial staff, working with teams, planning, or overseeing the facilities operations. In many companies, an administrator’s job is integral to the day-to-day functionality of the business. If there are environmental, office resource, or administrative issues the administrator resolves them.
In some smaller businesses, the administrator may be in charge of some human resource, accounting, and training functions. For example, interviewing, hiring, training, and assessing employees; or developing budgets, financial reports and procuring office supplies or resources. Administrators may transition into other positions such as that of general manager. As their jobs can be very demanding and is integral to the business, they are required to be very proficient and consistent.
Administrators may:
i. Manage office equipment
ii.  Liaise with facilities stakeholders
iii.  Maintain an enjoyable and clean working environment
iv.  Manage clerical and other administrative staff
v. Handle the distribution of correspondence and customary clerical tasks
vi. Arrange, organize, and coordinate meetings
vii. Handle internal or external communication or management systems
Administrators typically keep normal business hours. They receive good compensation packages. Their benefits may include pension, vacation, insurance, sick days, among other allowances. If they are required to travel, as a part of their functions, they receive travelling funds as well.

Administrators must possess qualifications in business. They should possess an MBA or other Masters degree. If they do not possess a master’s degree, having a first degree and experience is also valuable. Some companies offer training or job shadowing programs. Administrators should be lifelong learners, always developing and improving their skills.